Though “the condition of the working classes” is much different now than it was when Pope Leo XIII wrote Rerum Novarum in 1891, the document provides a strong justification of labor unions and their position in society. This is done in the context of a response to the advances of socialism on one hand and atheistic individualism on the other. It would be inflammatory, perhaps even violent, to identify the labor leaders of today with Leo’s socialists, and it would be a stretch to say that Hoffa & co. advocate state-owned means of production, but their contribution to political discourse is remarkably similar to Leo’s characterization of socialist tactics:

They are moreover, emphatically unjust, for they would rob the lawful possessor, distort the functions of the State, and create utter confusion in the community.

What I can’t find in Rerum Novarum is a justification for Hoffa’s insulting the mothers of Republican leaders. The “spirit of revolutionary change” which caused Leo to write the encyclical is not endorsed by it. (Video of Hoffa’s “remarks” here—strong language warning.)

As for Vice President Biden, he does seem to have read Pope Leo’s encyclical, or at least the part that says “perpetual conflict necessarily produces confusion and savage barbarity.” But he seems to have missed the sentence that follows:

Now, in preventing such strife as this, and in uprooting it, the efficacy of Christian institutions is marvelous and manifold.

The Vice President’s careful maintenance of his wall of separation between faith and government is admirable.